Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7394#discussion_r34620585
--- Diff:
yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClientSchedulerBackend.scala
---
@@ -61,6 +60,9 @@ private[spark] class YarnClientSchedulerBackend(
// to the executors
super.start()
+ if (conf.contains("spark.yarn.credentials.file")) {
+ YarnSparkHadoopUtil.get.startExecutorDelegationTokenRenewer(conf)
--- End diff --
This looks a little out of place to the uninitiated, since this code is
running in the driver. IIUC, what's happening in client mode is that the AM is
still doing the relogin / token renewal, and now the driver is just monitoring
HDFS, like other executors, to get the updated tokens.
Is that correct? Could you add a comment explaining that if so?
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